EA3027 ASSESSMENT 2 – 2022/2023 Academic Session 1.0 INTRODUCTION This assessment weighting is 50% of the course grade and contains 2 parts (Part A and Part B). Part A – You are required to solve geotechnical problems and present your solutions in Microsoft word or PDF format. Part B – You are required to research one of the listed geotechnical failures and present your findings in an 8 – 10 minutes recorded PowerPoint presentation. 2.0 SCHEDULE Release date: 12:00 Tuesday, 22 November 2022 Submission deadline: 12:00 Thursday, 8 December 2022 Submission format: Online submission on MyAberdeen of a single file containing individual solutions to the problems in Part A and a separate submission of the PowerPoint presentation (Part B) on Panopto. 3.0 PREAMBLES Associated Learning Outcomes This assessment will allow the students to demonstrate that they: Have gained intellectual skills so that they can: to be able to solve problems of some complexity or with some degree of novelty in geotechnics Have knowledge and understanding of: immediate and consolidation settlement in soils groundwater and concept of effective stresses in soils the basis of most equations and charts used for solving geotechnical problems Rela
ted Topics from the syllabus Engineering Geology: The rock cycle. Rock-forming minerals. Physical properties of minerals. Classification and processes involved in the formation of rocks: igneous, sedimentary, and metamorphic rocks. Plate tectonics. Aggregates. Groundwater. Fluviatile and coastal processes. Site investigation, including geophysical techniques. The oedometer test. The compression and expansion index. Consolidation. 1-D consolidation settlement. Degree of consolidation. Taraghi’s Theory of 1D consolidation. The log time (Casagrande’s method) and root time method (Taylor’s method). Shear Strength of Soils: Internal friction. Cohesion. Coulomb’s Law. Mohr circle of stress. Conditions of failure. Triaxial tests. Direct shear test. Shear strength of normally consolidated and over-consolidated sands and clays. Introduction to the critical state of soils. 4.0 PART A (20 Marks) I. The results in Table 1 were obtained from an Unconsolidated Undrained (UU) triaxial compression tests on three identical specimens of saturated soil: Table 1. Lateral pressure (kN/m2) 60 130 190 Total vertical stress (kN/m2) 210 281 340 a.
Determine the shear strength parameters for the soil by plotting the
Mohr’s circle.